01 - Combine milk and heavy cream in a medium saucepan over medium heat. Bring just to a simmer without boiling.
02 - Whisk in cream cheese until completely melted and the mixture is smooth.
03 - Gradually add shredded white American cheese, one handful at a time, whisking constantly until fully melted and the dip is creamy and smooth.
04 - Stir in diced jalapeño, green chilies, onion, and garlic. Cook for 2-3 minutes, stirring frequently, until vegetables soften.
05 - Add ground cumin, chili powder, salt, and white pepper. Taste and adjust seasoning as desired.
06 - Reduce heat to low to keep warm until serving. Stir occasionally and add a splash of milk if the dip becomes too thick. Serve with tortilla chips or fresh vegetables.